Regenerative stove.



No. 8033284.. PATENTED OCT. 31, 1905. J. M. HARTMAN & J. S. KENNEDY. REGENERATIVE STOVE.

APPLICATION FILED JAN. 3,1905.

2 SHEETS-SHBET 1.

No. 803,284. PATENTED OCT. 31, 1905. J. M. HARTMAN & J. S. KENNEDY.

REGENERATIVB STOVE. APPLIGATIONIILED'JANJ,1905.

2 SHEETS-SHEET 2.

nun unzunn l1|| mnumun unzuunnfln nuunuuuuu UDDDDDDDD RN QUDUDDDUDD Duncan-Dunn UUUDUUDUDUU DUDDUUUUDUD DDDUUUUDUDU DUDDUUUUUUU UUUUDUDUUDU UUUUUUUDUUU UUDDUUUUDDU DUDDUUUUDUU UDUDDDUDUUD UDUDDUDUDD Dn-DUDUDDDU UDUDDUUUU DUUUUUUDD DUUUDDH-D DUN-DUB UUUDD UH- UNITED STATES PATENT" OFFICE.

JOHN M. HARTMAN, OF PHILADELPHIA, PENNSYLVANIA, AND JOHN S. KENNEDY, OF STANHOPE, NEW' JERSEY.

REGENERATIVE STOVE.

Patented Oct. 31, 1905.

' Application filed January 3, 1905. Serial No. 289,285.

To all whom it may concern.-

Be it known that we, JOHN M. HARTMAN,

of Philadelphia, in the State of Pennsylvania, and JOHN S. KENNEDY, of Stanhope, in the State of New Jersey, have invented certain new and useful Improvements in Regenerative Stoves, whereof the following is a specification, reference being had to the acpanying drawings. Our invention relates to apparatus comprising brickwork which is alternately traversed by the hot gaseous products of combustion from a blast-furnace and by the cold-air blast before its introduction to the furnace, so as to utilize the heat from said gas which would otherwise be wasted. I

Ordinarily such stoves are made with two parallel vertical passes inclosing brick' checker-work, and the combustion of the waste gases occurs in the chamber in the stove at the bottom of the first pass, from which chamber the products of combustion rise through that pass and descend the other pass to a chimney-vent at the bottom of the stove. Said chamber being arched at the top to support the checker-work must be of excessive height, for unless said arches are sufficiently remote from the region of the extreme temperature of combustion in said chamber they are rapidly disintegrated, for r the flue-dust being deposited on and above said arches melts, scorifies the brickwork, and forms a liquid cinder which falls to the bottom of the chamber and there congeals and must be subsequently broken up with sledges and bars to remove it.

It is the object of our invention to render a greater portion of the height of the first pass in such a stove available for heating brickwork and to render the latter more durable by locating the combustion-chamber exterior to the stove, so that the temperature of the gas is lowered .by expansion before its con-- tact with the brickwork in the stove, and the solid products of combustion are deposited in said exterior combustion chamber, where they are readily accessible for removal.

It is characteristic of our invention, as hereinafter described, that the air-blast to be heated passes both through the stove and through the combustion-chamber and that the conduits connecting the combustion-chamb er with the stove are valveless, the flow of both the gas and air being controlled by valves eX- terior to said conduits.

- Our invention comprises the various novel features of construction and arrangement, hereinafter more definitely specified.

Figure I is a vertical sectional view through the stove conveniently embodying our improvements. Fig. II is a plan sectional View taken on the line H II in Fig. I. In said figures, 1 is the circular casing of the stove, provided with the dome 2 and having the central vertical partition 3, forming the two vertical parallel passes 4 and 5, which are connected by the opening 6 under said dome. Said pass 4 is the one first traversed by the hot gases, and the arches 8 therein form the top of the distributing-chamber 10, from which the gases are distributed through the brick checker-work 12, supported by said arches. The checker-work 14 in the pass 5 is supported by the transverse beams 15 and pillars 16.

The lower end of the pass 5 is provided with vents 17, through which the products of combustion of the gas are discharged to the chimney. Said pass 5 is also provided with a cold-air inlet 18, controlled by the alve 19.

The combustion-chamber 20 is located exterior to the stove-casing 1, and its interior communicates with said distributing-chamber 10 through a plurality of conduits 21, which insure a more equal distribution of the hot gas than if a single conduit were employed. Said combustion-chamber 20 is provided with the hot-gas inlet 22, controlled by the valve 23, and it is to be understood that said inlet 22 is in communication with a source of gassupplyfor instance, a blastfurnace. Said combustion-chamber 20 is also provided with air-inlets 28 and with the ing-charnber 10 and also cleaning-doors 31 at the lower end of the pass 5.

The apparatus aforesaid is operated as follows: The cold-blast-inlet valve 19 and the hot-blast-outlet valve 27 being closed and the gas-inlet valve 23 being open, the gas flows through the combustion-chamber 20, where its combustion is completed by means of air entering at the inlets 28, so that practically all of the flue-dust is deposited tnerein. Of course burning the gas in the combustionchamber increases its volume and correspondingly lowers its temperature, although it does not decrease the total heat carried thereby to the stove, and on entering the distributingchamber 10 the greater volume of gas distributes itself more uniformly through the brickwork in the pass 4, through which it rises, and thence descends through the pass 5 to the chimney-vents 17, through which it escapes. The flow of thehot gas having been maintained through the stove, as described, until the brickwork 12 and 14in the passes 4 and 5 is sufiiciently heated, the gas is diverted to another stove, the valve 23 and the air-inlets 28 are closed, and the valves 19 and 27 are opened, so that cold air enters through the inlet 18, rises through the hot brickwork 14, descends through the hot brickwork 12 to the chamber 10, and flows thence throu h the conduits 21 into the combustion-chamber 20, from which it is discharged as hot blast to the furnace through the hot-air outlet 26.

Although we prefer to employ two conduits 21 between the exterior combustion-chamber 20 and the interior distributing-chamber 10 of the stove, it is to be understood that a single conduit may be employed in the smaller sizes of apparatus. It is to be noted that the interior of the conduits 21, which are maintained at extremely-high temperature, are valveless and that the alternate flow of the gas and air through the apparatus always traverses both stove and combustion-chamber and is controlled solely by valves exterior to said conduits. Attention is particularly invited to this feature of the construction for the reason that unsuccessful attempts have been made to control the flow of heated gases in apparatus of this kind by means of valves located in the region of extreme temperature, with the result that such ap aratus is rendered impracticable by the a most immediate destruction of such valves.

We do not desire to limit ourselves to the precise details of construction and arrangement herein specified, as it is obvious that various modifications may be made therein without departing from the essential features of our invention.

We claim I 1. In a regenerative stove, the combination with a casing inclosing brickwork, and

having a cold-air inlet and a chimney-vent; of a combustion-chamber exterior to said casing, having a hot-gas inlet an air-inlet and a hot-air outlet; a conduit between said combustion-chamber and said casin and means, exterior to said conduit, contro ling the flow therethrough, substantially as set forth.

2. In a regenerative stove, the combination with a casing inclosing brickwork, and having a cold-air inlet and a chimney-vent; of a combustion-chamber exterior to said casing, having a hot-gas inlet an air-inlet and a hot-air outlet; a conduit between said combustion-ch amber andsaid casing; and means, exterior to said-conduit, controlling the flow of hot gas and hot air alternately therethrough, substantially as set forth.

3. In a regenerative stove comprising two passes inclosing checker-work; a cold-air inlet and a chimney-vent in the lower portion of one of said passes; a distributing-chamber in the lower portion of the other pass; a'combustion-chamber external to said stove; a conduit connecting said combustion-chamber with said distributing-chamber a gas-inlet and an air-inlet to said combustioncham ber; a hot-air outlet from said combustionchamber; and, valves exterior to said conduit, controlling the alternate flow of gas and air therethrough, substantially as set forth.

4. In a regenerative stove, comprising two vertical passes, inclosing checker *work; a cold-air inlet and a chimney-vent in the lower portion of one of said passes; a distributingchamber in the lower portion of the other pass; a combustion-chamber external to said stove; a conduit connecting said combustionchamber with said distributing-chamber; a gas-inlet and an airinlet to said combustionchamber; a hot-air outlet from said combustion-chamber; and, valves, exterior to said stove, conduit, and combustion-chamber, independently controlling said gas-inlet and hot-air outlet, substantially as set forth.

5. The combination with a regenerative stove comprising passes having a cold-air inlet and chimne -vent at one end and a distributing-cham er at the other end; of a combustion-chamber external to said stove; a conduit connectin said combustion-cham ber with said distri uting-chamber a gasinlet and an air-inlet to said combustion-chamber; a hot-air outlet from said combustion chamber; and, valves, exterior to said conduit, independently controlling said gas-inlet and hot-air outlet; whereby, air may be conducted from said cold-air inlet through said stove, conduit and combustion-chamber, and

discharged throu h the hot-air outlet of the latter, substantia ly as set forth.

6. The combination with a regenerative at Stanhope, New Jersey, this 28th day of December, 1904.

JOHN M. HARTMAN. JOHN S. KENNEDY.

Witnesses re John M. Hartman:

ARTHUR E. PAIGE, ANNA F. GETZFREAD, Witnesses re John S. Kennedy:

J. J. SHAW, E. R. HERRIOK. 

